package com.zx.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.zx.reggie.common.BaseContext;
import com.zx.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @author 张旭
 * @version 1.0
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        log.info("拦截到请求：{}", request.getRequestURI());
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //判断本次请求的uri是否要处理
        boolean check = checkURI(urls, requestURI);
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //判断是否处于员工登录状态
        Long employee = (Long) request.getSession().getAttribute("employee");
        if (employee != null) {
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId(employee);
            filterChain.doFilter(request, response);
            return;
        }

        //判断是否处于用户登录状态
        Long user = (Long) request.getSession().getAttribute("user");
        if (user != null) {
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            BaseContext.setCurrentId(user);
            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean checkURI(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
